Update Lightning Terminal to v0.6.3 (#605)

docs/lightning-terminal.md

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+# Lightning Terminal (LiT)
+
+[Lightning Terminal](https://github.com/lightninglabs/lightning-terminal) (LiT) is a browser-based interface for managing channel liquidity.
+It integrates the Lightning Labs services Loop, Poold and Faraday all in one and offers a web UI to manage them.
+LND required.
+
+## Installation
+
+To install the Lightning Terminal service, you need to set a password for the login.
+
+```bash
+# Set password
+export LIT_PASSWD="sUpErSeCuRe"
+
+# Add fragment and run setup
+BTCPAYGEN_ADDITIONAL_FRAGMENTS="$BTCPAYGEN_ADDITIONAL_FRAGMENTS;opt-add-lightning-terminal"
+. btcpay-setup.sh -i
+```
+
+Afterwards you should see Lightning Terminal appear as a service on the Server Settings > Services page in BTCPay Server.
+
+## Troubleshooting
+
+To see the logs of the Lightning Terminal service, you can run this command:
+
+```bash
+docker logs -f generated_lnd_lit_1
+```